/* Dedicated lesson surfaces: each concept gets its own field guide. */
.lesson-page {
  background: var(--paper);
}

.lesson-page main {
  overflow: clip;
}

.lesson-progress {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  color: var(--text-muted);
  padding: 0.72rem clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-progress-inner {
  align-items: center;
  display: flex;
  gap: 1rem;
  margin: 0 auto;
  max-width: var(--max);
}

.lesson-progress-label,
.lesson-progress-state,
.lesson-eyebrow,
.lesson-back,
.one-line-label,
.walkthrough-kicker,
.demo-index,
.demo-action,
.demo-note,
.choice-label,
.lesson-map-label,
.lesson-map-legend,
.quiz-kicker,
.quiz-option,
.quiz-feedback,
.lesson-next-label,
.lesson-next-index {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-progress-label,
.lesson-progress-state {
  font-size: 0.49rem;
}

.lesson-progress-label {
  color: var(--ink);
}

.lesson-progress-state {
  color: var(--text-muted);
  white-space: nowrap;
}

.lesson-progress-track {
  background: rgba(11, 16, 20, 0.12);
  height: 2px;
  max-width: 300px;
  position: relative;
  width: 100%;
}

.lesson-progress-track span {
  background: var(--orange);
  display: block;
  height: 100%;
  width: 14.2857%;
}

.network-page .lesson-progress-track span {
  width: 14.2857%;
}

.gradient-page .lesson-progress-track span {
  background: var(--blue);
  width: 28.5714%;
}

.lesson-hero {
  background-color: var(--ink);
  background-image: linear-gradient(rgba(238, 242, 234, 0.055) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.055) 1px, transparent 1px), radial-gradient(circle at 75% 48%, rgba(135, 159, 255, 0.17), transparent 33%);
  background-size: 72px 72px, 72px 72px, auto;
  color: var(--paper);
  display: grid;
  gap: clamp(2rem, 6vw, 7rem);
  grid-template-columns: minmax(260px, 0.78fr) minmax(420px, 1.22fr);
  min-height: 650px;
  overflow: hidden;
  padding: clamp(3.5rem, 7vw, 7rem) clamp(1.25rem, 7vw, 8.5rem);
  position: relative;
}

.lesson-hero::before {
  background: repeating-linear-gradient(135deg, var(--orange) 0 8px, transparent 8px 16px);
  bottom: 0;
  content: '';
  height: 8px;
  left: 0;
  position: absolute;
  width: min(26vw, 340px);
}

.gradient-page .lesson-hero {
  background-image: linear-gradient(rgba(238, 242, 234, 0.055) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.055) 1px, transparent 1px), radial-gradient(circle at 75% 48%, rgba(255, 139, 103, 0.18), transparent 33%);
}

.gradient-page .lesson-hero::before {
  background: repeating-linear-gradient(135deg, var(--blue) 0 8px, transparent 8px 16px);
}

.lesson-hero-copy {
  align-self: center;
  max-width: 440px;
  position: relative;
  z-index: 2;
}

.lesson-back {
  align-items: center;
  color: rgba(238, 242, 234, 0.52);
  display: inline-flex;
  font-size: 0.52rem;
  gap: 0.6rem;
  margin-bottom: 4rem;
  text-decoration: none;
  transition: color 180ms ease, transform 180ms ease;
}

.lesson-back span {
  color: var(--mint);
  font-size: 1rem;
}

.lesson-back:hover,
.lesson-back:focus-visible {
  color: var(--paper);
  transform: translateX(-3px);
}

.lesson-eyebrow {
  align-items: center;
  color: var(--mint);
  display: flex;
  font-size: 0.55rem;
  gap: 0.7rem;
  margin: 0 0 1.6rem;
}

.lesson-eyebrow span {
  border: 1px solid currentColor;
  font-size: 0.47rem;
  padding: 0.42rem 0.45rem;
}

.lesson-hero h1 {
  font-family: var(--display);
  font-size: clamp(4.5rem, 8vw, 8.2rem);
  font-weight: 600;
  letter-spacing: -0.1em;
  line-height: 0.8;
  margin: 0;
  text-transform: uppercase;
}

.lesson-hero h1 em {
  color: var(--blue);
  font-style: normal;
}

.gradient-page .lesson-hero h1 em {
  color: var(--orange);
}

.lesson-dek {
  color: rgba(238, 242, 234, 0.65);
  font-size: 0.91rem;
  line-height: 1.75;
  margin: 2rem 0 0;
  max-width: 370px;
}

.one-line {
  border-left: 2px solid var(--mint);
  margin-top: 2.2rem;
  padding-left: 1rem;
}

.one-line-label {
  color: var(--mint);
  display: block;
  font-size: 0.49rem;
  margin-bottom: 0.45rem;
}

.one-line strong {
  color: var(--paper);
  display: block;
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 1.4;
}

.lesson-hero-art {
  align-self: center;
  min-height: 465px;
  position: relative;
}

.lesson-hero-art::before,
.lesson-hero-art::after {
  border: 1px solid rgba(135, 159, 255, 0.27);
  border-radius: 50%;
  content: '';
  height: 88%;
  position: absolute;
  right: -5%;
  top: 3%;
  transform: rotate(-18deg);
  width: 86%;
}

.lesson-hero-art::after {
  border-color: rgba(185, 255, 85, 0.2);
  height: 69%;
  right: 7%;
  top: 13%;
  transform: rotate(27deg);
  width: 68%;
}

.hero-art-window {
  background: var(--ink-soft);
  border: 1px solid rgba(238, 242, 234, 0.23);
  box-shadow: 13px 15px 0 rgba(0, 0, 0, 0.22);
  left: 4%;
  position: absolute;
  right: 4%;
  top: 10%;
  transform: rotate(2.5deg);
  z-index: 2;
}

.hero-art-top,
.hero-art-bottom {
  align-items: center;
  display: flex;
  font-family: var(--mono);
  font-size: 0.48rem;
  justify-content: space-between;
  letter-spacing: 0.08em;
  min-height: 42px;
  padding: 0 1rem;
  text-transform: uppercase;
}

.hero-art-top {
  border-bottom: 1px solid var(--line-light);
  color: rgba(238, 242, 234, 0.46);
}

.hero-art-top span:last-child {
  color: var(--mint);
}

.hero-art-map {
  background: radial-gradient(circle at 51% 48%, rgba(135, 159, 255, 0.14), transparent 30%), linear-gradient(rgba(238, 242, 234, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.06) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
  min-height: 340px;
  overflow: hidden;
  position: relative;
}

.hero-art-map svg {
  height: 100%;
  left: 3%;
  position: absolute;
  top: 3%;
  width: 94%;
}

.hero-art-map .art-edge {
  fill: none;
  stroke: url(#lessonEdge);
  stroke-width: 1.3;
}

.hero-art-map .art-flow {
  fill: none;
  stroke: var(--mint);
  stroke-dasharray: 4 24;
  stroke-linecap: round;
  stroke-width: 2;
  animation: data-flow 3.4s linear infinite;
}

.hero-art-map .art-node {
  animation: node-breathe 2.8s ease-in-out infinite;
  stroke: rgba(238, 242, 234, 0.65);
  stroke-width: 1.4;
}

.hero-art-map .art-input { fill: var(--mint); }
.hero-art-map .art-hidden { fill: var(--blue); animation-delay: -0.7s; }
.hero-art-map .art-output { fill: var(--orange); animation-delay: -1.2s; }

.hero-art-label {
  color: rgba(238, 242, 234, 0.45);
  font-family: var(--mono);
  font-size: 0.47rem;
  left: 7%;
  letter-spacing: 0.1em;
  position: absolute;
  text-transform: uppercase;
  top: 9%;
}

.hero-art-label.right {
  color: var(--orange);
  left: auto;
  right: 7%;
  top: auto;
  bottom: 12%;
}

.hero-art-bottom {
  border-top: 1px solid var(--line-light);
  color: rgba(238, 242, 234, 0.45);
}

.hero-art-bottom b {
  color: var(--mint);
  font-weight: 400;
}

.hero-art-bottom span:last-child {
  color: rgba(238, 242, 234, 0.34);
}

.gradient-hero-art::before,
.gradient-hero-art::after {
  border-color: rgba(255, 139, 103, 0.32);
}

.gradient-hero-art::after {
  border-color: rgba(135, 159, 255, 0.22);
}

.gradient-art-map {
  background: radial-gradient(circle at 47% 73%, rgba(255, 139, 103, 0.14), transparent 35%), linear-gradient(rgba(238, 242, 234, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.06) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
}

.gradient-art-map svg {
  height: 100%;
  overflow: visible;
  width: 100%;
}

.gradient-art-map .hero-grid {
  fill: none;
  stroke: rgba(238, 242, 234, 0.08);
  stroke-width: 1;
}

.gradient-art-map .hero-valley {
  fill: none;
  stroke: rgba(255, 139, 103, 0.82);
  stroke-dasharray: 2 8;
  stroke-width: 2;
}

.gradient-art-map .hero-trail {
  fill: none;
  stroke: var(--orange);
  stroke-dasharray: 4 8;
  stroke-width: 2;
}

.gradient-art-map .hero-dot-shadow { fill: rgba(255, 139, 103, 0.17); }
.gradient-art-map .hero-dot { fill: var(--orange); stroke: var(--paper); stroke-width: 2; }

.lesson-art-note {
  bottom: 1%;
  color: rgba(238, 242, 234, 0.42);
  font-family: var(--mono);
  font-size: 0.49rem;
  left: 8%;
  letter-spacing: 0.08em;
  position: absolute;
  text-transform: uppercase;
  z-index: 3;
}

.lesson-intro-strip {
  align-items: center;
  background: var(--mint);
  color: var(--ink);
  display: flex;
  gap: 2rem;
  justify-content: space-between;
  padding: 1.05rem clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-intro-strip strong {
  font-family: var(--display);
  font-size: clamp(1rem, 2vw, 1.38rem);
  font-weight: 600;
  letter-spacing: -0.06em;
}

.lesson-intro-strip span {
  font-family: var(--mono);
  font-size: 0.51rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-overview {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: clamp(4.5rem, 8vw, 8rem) clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-overview .walkthrough-section {
  align-items: start;
}

.overview-body,
.overview-card,
.overview-flow,
.overview-detail,
.overview-cta {
  min-width: 0;
}

.overview-cards,
.overview-details {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.overview-card {
  background: rgba(11, 16, 20, 0.035);
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  padding: clamp(1rem, 2vw, 1.35rem);
}

.overview-card:last-child {
  border-top-color: var(--blue);
}

.gradient-page .overview-card:first-child {
  border-top-color: var(--blue);
}

.gradient-page .overview-card:last-child {
  border-top-color: var(--orange);
}

.overview-label,
.overview-flow-heading span,
.overview-step-index {
  color: var(--text-muted);
  display: block;
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overview-card:first-child .overview-label,
.overview-detail:first-child .overview-label {
  color: var(--orange);
}

.gradient-page .overview-card:first-child .overview-label {
  color: var(--blue);
}

.overview-card h3,
.overview-detail h3 {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  font-weight: 600;
  letter-spacing: -0.07em;
  line-height: 1;
  margin: 0.75rem 0 0;
}

.overview-card p,
.overview-detail p {
  color: var(--text-muted);
  font-size: 0.73rem;
  line-height: 1.75;
  margin: 0.8rem 0 0;
}

.overview-flow {
  background: var(--ink);
  border: 1px solid rgba(11, 16, 20, 0.55);
  color: var(--paper);
  margin-top: 0.8rem;
  padding: clamp(1rem, 2vw, 1.35rem);
}

.overview-flow-heading {
  align-items: baseline;
  border-bottom: 1px solid var(--line-light);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  justify-content: space-between;
  padding-bottom: 0.85rem;
}

.overview-flow-heading span {
  color: rgba(238, 242, 234, 0.48);
}

.overview-flow-heading strong {
  color: var(--mint);
  font-family: var(--display);
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  font-weight: 500;
  letter-spacing: -0.06em;
}

.gradient-page .overview-flow-heading strong {
  color: var(--orange);
}

.overview-flow-list {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.overview-flow-step {
  min-width: 0;
  padding: 1rem 1rem 0.15rem 0;
}

.overview-flow-step + .overview-flow-step {
  border-left: 1px solid var(--line-light);
  padding-left: 1rem;
}

.overview-step-index {
  color: var(--mint);
}

.overview-flow-step:nth-child(3) .overview-step-index {
  color: var(--orange);
}

.overview-flow-step strong {
  color: var(--paper);
  display: block;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 1.1;
  margin-top: 0.55rem;
}

.overview-flow-step p {
  color: rgba(238, 242, 234, 0.58);
  font-size: 0.69rem;
  line-height: 1.7;
  margin: 0.5rem 0 0;
}

.overview-details {
  margin-top: 0.8rem;
}

.overview-detail {
  background: rgba(11, 16, 20, 0.035);
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
  padding: clamp(1rem, 2vw, 1.25rem);
}

.overview-detail:last-child {
  border-left-color: var(--orange);
}

.gradient-page .overview-detail:first-child {
  border-left-color: var(--orange);
}

.gradient-page .overview-detail:last-child {
  border-left-color: var(--blue);
}

.overview-detail:last-child .overview-label {
  color: var(--overview-accent, var(--orange));
}

.overview-cta {
  align-items: center;
  background: var(--ink);
  border: 1px solid var(--ink);
  color: var(--paper);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-top: 0.8rem;
  padding: 1rem 1.15rem;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.overview-cta-label {
  color: var(--mint);
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overview-cta strong {
  align-items: center;
  display: flex;
  font-family: var(--display);
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 500;
  gap: 0.65rem;
  letter-spacing: -0.06em;
  line-height: 1.1;
  text-align: right;
}

.overview-cta strong span {
  color: var(--mint);
  font-size: 1.15em;
}

.gradient-page .overview-cta {
  border-color: var(--blue);
}

.gradient-page .overview-cta-label,
.gradient-page .overview-cta strong span {
  color: var(--blue);
}

.overview-cta:hover,
.overview-cta:focus-visible {
  background: var(--ink-soft);
  border-color: var(--mint);
  transform: translateY(-2px);
}

.gradient-page .overview-cta:hover,
.gradient-page .overview-cta:focus-visible {
  border-color: var(--orange);
}

.lesson-content-section {
  background: var(--paper);
  padding: clamp(5rem, 9vw, 9rem) clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-content-section.dark-section {
  background: var(--ink);
  color: var(--paper);
}

.walkthrough-section {
  display: grid;
  gap: clamp(2rem, 7vw, 8rem);
  grid-template-columns: minmax(280px, 0.68fr) minmax(0, 1.32fr);
  margin: 0 auto;
  max-width: var(--max);
}

.walkthrough-intro {
  max-width: 370px;
  min-width: 0;
}

.walkthrough-kicker {
  color: var(--text-muted);
  display: flex;
  font-size: 0.53rem;
  gap: 0.7rem;
  margin: 0 0 1.5rem;
}

.dark-section .walkthrough-kicker {
  color: var(--mint);
}

.walkthrough-kicker span {
  color: var(--orange);
}

.walkthrough-intro h2 {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(3rem, 5.5vw, 6rem);
  font-weight: 600;
  letter-spacing: -0.1em;
  line-height: 0.82;
  margin: 0;
  overflow-wrap: anywhere;
  text-transform: uppercase;
}

.dark-section .walkthrough-intro h2 {
  color: var(--paper);
}

.walkthrough-intro h2 em {
  color: var(--orange);
  font-style: normal;
}

.dark-section .walkthrough-intro h2 em {
  color: var(--mint);
}

.walkthrough-intro > p:last-child {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.75;
  margin: 2rem 0 0;
  max-width: 290px;
}

.dark-section .walkthrough-intro > p:last-child {
  color: rgba(238, 242, 234, 0.55);
}

.walkthrough-body {
  min-width: 0;
}

.walkthrough-body > h3 {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.65rem, 3vw, 2.65rem);
  font-weight: 600;
  letter-spacing: -0.08em;
  line-height: 1;
  margin: 0 0 0.9rem;
}

.dark-section .walkthrough-body > h3 {
  color: var(--paper);
}

.walkthrough-body > .body-lede {
  color: var(--text-muted);
  font-size: 0.83rem;
  line-height: 1.75;
  margin: 0 0 1.8rem;
  max-width: 530px;
}

.dark-section .walkthrough-body > .body-lede {
  color: rgba(238, 242, 234, 0.55);
}

.lesson-demo {
  background: var(--ink);
  border: 1px solid rgba(11, 16, 20, 0.55);
  color: var(--paper);
  overflow: hidden;
}

.lesson-demo.demo-orange {
  border-color: rgba(255, 139, 103, 0.55);
}

.demo-topbar,
.demo-bottombar {
  align-items: center;
  display: flex;
  justify-content: space-between;
  min-height: 51px;
  padding: 0 1rem;
}

.demo-topbar {
  border-bottom: 1px solid var(--line-light);
  flex-wrap: wrap;
  gap: 0.55rem;
}

.demo-actions {
  align-items: center;
  display: flex;
  gap: 0.2rem;
  margin-left: auto;
}

.demo-index,
.demo-action,
.demo-note {
  color: rgba(238, 242, 234, 0.43);
  font-size: 0.48rem;
}

.demo-index {
  color: var(--orange);
}

.demo-action {
  background: transparent;
  border: 0;
  color: rgba(238, 242, 234, 0.55);
  padding: 0.4rem;
  transition: color 180ms ease, transform 180ms ease;
}

.demo-action:hover,
.demo-action:focus-visible {
  color: var(--mint);
  transform: rotate(-9deg);
}

.demo-action span {
  color: var(--mint);
  font-size: 0.9rem;
  margin-left: 0.25rem;
}

.demo-action.remix-action {
  color: var(--mint);
}

.demo-orange .demo-action.remix-action {
  color: var(--orange);
}

.demo-orange .demo-action.remix-action span {
  color: var(--blue);
}

.demo-network-map {
  aspect-ratio: 640 / 300;
  background: radial-gradient(circle at 53% 49%, rgba(135, 159, 255, 0.14), transparent 32%), linear-gradient(rgba(238, 242, 234, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.045) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
  min-height: 265px;
  overflow: hidden;
  position: relative;
  --signal-accent: var(--mint);
  --signal-glow: rgba(185, 255, 85, 0.45);
  --signal-clarity: 0.72;
  transition: background 350ms ease;
}

.demo-network-map[data-input='sound'] {
  background: radial-gradient(circle at 53% 49%, rgba(255, 139, 103, 0.18), transparent 32%), linear-gradient(rgba(238, 242, 234, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.045) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
}

.demo-network-map[data-input='text'] {
  background: radial-gradient(circle at 53% 49%, rgba(135, 159, 255, 0.2), transparent 32%), linear-gradient(rgba(238, 242, 234, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.045) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
}

.demo-network-map::after {
  border: 1px dashed rgba(238, 242, 234, 0.13);
  border-radius: 50%;
  content: '';
  height: 70%;
  left: 27%;
  position: absolute;
  top: 15%;
  width: 45%;
}

.demo-network-map svg {
  height: 100%;
  position: absolute;
  width: 100%;
  z-index: 1;
}

.signal-particles {
  inset: 0;
  pointer-events: none;
  position: absolute;
  z-index: 2;
}

.signal-particle {
  animation: particle-shimmer var(--particle-duration, 2.8s) ease-in-out var(--particle-delay, 0s) infinite;
  background: var(--signal-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--signal-accent), transparent 82%), 0 0 16px var(--signal-glow);
  height: var(--particle-size, 4px);
  left: var(--particle-x);
  opacity: calc(0.22 + var(--signal-clarity) * 0.7);
  position: absolute;
  top: var(--particle-y);
  transform: translate3d(-50%, -50%, 0) scale(0.6);
  width: var(--particle-size, 4px);
}

.signal-particle::after {
  background: var(--signal-accent);
  content: '';
  height: 1px;
  left: calc(var(--particle-size, 4px) * 0.75);
  opacity: 0.45;
  position: absolute;
  top: 50%;
  transform: rotate(var(--particle-angle, 0deg));
  transform-origin: left center;
  width: var(--particle-streak, 12px);
}

.demo-network-map.is-remixing .signal-particle {
  animation-duration: 1.05s;
}

.demo-network-map.is-flowing .signal-particle {
  animation-name: particle-travel;
}

@keyframes particle-shimmer {
  0%, 100% {
    opacity: 0.08;
    transform: translate3d(-50%, -50%, 0) scale(0.55);
  }

  50% {
    opacity: calc(0.34 + var(--signal-clarity) * 0.62);
    transform: translate3d(calc(-50% + var(--particle-dx, 8px)), calc(-50% + var(--particle-dy, -4px)), 0) scale(1);
  }
}

@keyframes particle-travel {
  0% {
    opacity: 0;
    transform: translate3d(-50%, -50%, 0) scale(0.35);
  }

  30% {
    opacity: calc(0.4 + var(--signal-clarity) * 0.6);
    transform: translate3d(calc(-50% + var(--particle-dx, 8px)), calc(-50% + var(--particle-dy, -4px)), 0) scale(1.1);
  }

  100% {
    opacity: 0;
    transform: translate3d(calc(-50% + var(--particle-dx, 8px) * 2), calc(-50% + var(--particle-dy, -4px) * 2), 0) scale(0.4);
  }
}

.demo-network-map .lab-edge {
  fill: none;
  opacity: calc(0.22 + var(--signal-clarity) * 0.42);
  stroke: url(#networkLessonEdge);
  stroke-width: 1.2;
}

.demo-network-map .lab-flow {
  fill: none;
  stroke: var(--signal-accent);
  stroke-dasharray: 3 22;
  stroke-linecap: round;
  stroke-width: 2;
  animation: data-flow 3s linear infinite;
}

.demo-network-map .network-highlight-paths {
  fill: none;
  pointer-events: none;
}

.demo-network-map .highlight-path {
  fill: none;
  stroke: var(--signal-accent);
  stroke-dasharray: 11 10;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 4;
  filter: drop-shadow(0 0 7px var(--signal-glow));
  opacity: 0.88;
  animation: highlight-route 800ms ease both;
}

@keyframes highlight-route {
  from { opacity: 0; stroke-dashoffset: 62; }
  to { opacity: 0.88; stroke-dashoffset: 0; }
}

.demo-network-map[data-input='sound'] .lesson-node[data-node='input'] span {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 139, 103, 0.1);
}

.demo-network-map[data-input='text'] .lesson-node[data-node='input'] span {
  background: var(--blue);
  box-shadow: 0 0 0 5px rgba(135, 159, 255, 0.1);
}

.demo-network-map[data-input='text'] .lesson-node[data-node='hidden'] span {
  background: var(--blue);
}

.lesson-node {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 50%;
  display: flex;
  height: 31px;
  justify-content: center;
  padding: 0;
  position: absolute;
  transform: translate(-50%, -50%);
  width: 31px;
  z-index: 3;
}

.lesson-node::before {
  border: 1px solid var(--mint);
  border-radius: 50%;
  content: '';
  inset: 1px;
  opacity: 0;
  position: absolute;
  transition: inset 180ms ease, opacity 180ms ease;
}

.lesson-node span {
  background: var(--blue);
  border: 1px solid rgba(238, 242, 234, 0.68);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(135, 159, 255, 0.08);
  display: block;
  height: 12px;
  transition: background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
  width: 12px;
}

.lesson-node[data-node='input'] span { background: var(--mint); box-shadow: 0 0 0 5px rgba(185, 255, 85, 0.08); }
.lesson-node[data-node='output'] span { background: var(--orange); height: 16px; width: 16px; }
.lesson-node:hover span,
.lesson-node:focus-visible span,
.lesson-node.is-selected span { box-shadow: 0 0 0 7px rgba(185, 255, 85, 0.14), 0 0 22px rgba(185, 255, 85, 0.4); transform: scale(1.22); }
.lesson-node:hover::before,
.lesson-node:focus-visible::before,
.lesson-node.is-selected::before { inset: -4px; opacity: 0.75; }

.lab-node-1 { left: 10%; top: 24%; }
.lab-node-2 { left: 10%; top: 50%; }
.lab-node-3 { left: 10%; top: 87%; }
.lab-node-4 { left: 33.75%; top: 13.3%; }
.lab-node-5 { left: 33.75%; top: 50%; }
.lab-node-6 { left: 33.75%; top: 86.7%; }
.lab-node-7 { left: 60.9%; top: 27.3%; }
.lab-node-8 { left: 60.9%; top: 72.7%; }
.lab-node-9 { left: 85.6%; top: 50%; }

.lesson-map-label {
  color: rgba(238, 242, 234, 0.4);
  font-size: 0.48rem;
  position: absolute;
  z-index: 4;
}

.lesson-map-label.data-label { left: 4%; top: 6%; }
.lesson-map-label.pattern-label { color: var(--blue); left: 43%; top: 6%; }
.lesson-map-label.answer-label { color: var(--orange); right: 4%; top: 6%; }

.demo-network-readout {
  align-items: flex-start;
  background: rgba(238, 242, 234, 0.05);
  border-top: 1px solid var(--line-light);
  display: flex;
  gap: 0.8rem;
  min-height: 82px;
  padding: 0.85rem 1rem;
}

.readout-symbol {
  align-items: center;
  background: var(--mint);
  color: var(--ink);
  display: flex;
  flex: 0 0 29px;
  font-size: 1.25rem;
  height: 29px;
  justify-content: center;
}

.demo-network-readout span,
.demo-network-readout strong,
.demo-network-readout p {
  display: block;
}

.demo-network-readout span {
  color: var(--mint);
  font-family: var(--mono);
  font-size: 0.46rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
  text-transform: uppercase;
}

.demo-network-readout strong {
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.05em;
}

.demo-network-readout p {
  color: rgba(238, 242, 234, 0.53);
  font-size: 0.63rem;
  line-height: 1.45;
  margin: 0.25rem 0 0;
}

.network-insight-row {
  background: rgba(238, 242, 234, 0.025);
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
}

.feature-inspector,
.prediction-panel {
  min-width: 0;
  padding: 0.85rem 1rem;
}

.feature-inspector {
  border-right: 1px solid var(--line-light);
}

.insight-heading {
  align-items: baseline;
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
  margin-bottom: 0.65rem;
}

.insight-heading span,
.insight-heading strong {
  display: block;
}

.insight-heading span {
  color: rgba(238, 242, 234, 0.42);
  font-family: var(--mono);
  font-size: 0.43rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.insight-heading strong {
  color: var(--signal-accent, var(--mint));
  font-family: var(--display);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  text-align: right;
}

.feature-matrix,
.filter-matrix {
  display: grid;
  gap: 0.22rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-matrix {
  min-height: 61px;
}

.feature-matrix i,
.filter-matrix i {
  background: var(--signal-accent, var(--mint));
  display: block;
  min-height: 0;
  opacity: calc(0.08 + var(--activation, 0.5) * 0.92);
  transform: translateY(var(--activation-shift, 0));
  transition: opacity 260ms ease, transform 260ms ease, background 260ms ease;
}

.filter-matrix {
  background: var(--ink);
  gap: 0.3rem;
  padding: 0.5rem;
}

.filter-matrix i {
  background: var(--mint);
  min-height: 18px;
}

.prediction-bars {
  display: grid;
  gap: 0.38rem;
}

.prediction-row {
  align-items: center;
  display: grid;
  gap: 0.45rem;
  grid-template-columns: 3.1rem minmax(0, 1fr) 2.2rem;
}

.prediction-row > span:first-child,
.prediction-row b {
  color: rgba(238, 242, 234, 0.58);
  font-family: var(--mono);
  font-size: 0.43rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.prediction-row b {
  color: var(--paper);
  font-weight: 400;
  text-align: right;
}

.prediction-track {
  background: rgba(238, 242, 234, 0.1);
  display: block;
  height: 5px;
  overflow: hidden;
}

.prediction-fill {
  background: var(--signal-accent, var(--mint));
  display: block;
  height: 100%;
  transition: width 420ms cubic-bezier(0.2, 0.8, 0.2, 1), background 260ms ease;
}

.demo-controls {
  border-top: 1px solid var(--line-light);
  display: flex;
  gap: 0.8rem;
  padding: 1rem;
}

.network-action-stack {
  display: grid;
  flex: 0 0 154px;
  gap: 0.6rem;
}

.network-action-stack .demo-play {
  min-width: 0;
  width: 100%;
}

.signal-clarity-control {
  display: block;
}

.signal-clarity-control > span {
  align-items: center;
  color: rgba(238, 242, 234, 0.42);
  display: flex;
  font-family: var(--mono);
  font-size: 0.43rem;
  justify-content: space-between;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.signal-clarity-control output {
  color: var(--signal-accent, var(--mint));
}

.signal-clarity-control input[type='range'] {
  appearance: none;
  background: linear-gradient(90deg, var(--signal-accent, var(--mint)) 72%, rgba(238, 242, 234, 0.14) 72%);
  display: block;
  height: 2px;
  width: 100%;
}

.signal-clarity-control input[type='range']::-webkit-slider-thumb {
  appearance: none;
  background: var(--signal-accent, var(--mint));
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--signal-accent, var(--mint));
  height: 13px;
  width: 13px;
}

.signal-clarity-control input[type='range']::-moz-range-thumb {
  background: var(--signal-accent, var(--mint));
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--signal-accent, var(--mint));
  height: 9px;
  width: 9px;
}

.choice-row {
  display: grid;
  flex: 1;
  gap: 0.45rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.input-choice {
  background: rgba(238, 242, 234, 0.045);
  border: 1px solid rgba(238, 242, 234, 0.12);
  color: rgba(238, 242, 234, 0.7);
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
  min-height: 66px;
  padding: 0.62rem;
  text-align: left;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.input-choice:hover,
.input-choice:focus-visible,
.input-choice.is-selected {
  background: rgba(185, 255, 85, 0.1);
  border-color: var(--mint);
  color: var(--paper);
}

.input-choice .choice-glyph {
  color: var(--mint);
  font-family: var(--display);
  font-size: 1.15rem;
  line-height: 1;
}

.input-choice strong {
  font-family: var(--display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: -0.04em;
}

.input-choice small {
  color: rgba(238, 242, 234, 0.42);
  font-size: 0.48rem;
  line-height: 1.3;
}

.demo-play,
.next-step-button {
  align-items: center;
  background: var(--mint);
  border: 0;
  color: var(--ink);
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.52rem;
  gap: 0.8rem;
  justify-content: space-between;
  min-width: 142px;
  padding: 0.75rem;
  text-transform: uppercase;
  transition: background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.demo-play:hover,
.demo-play:focus-visible,
.next-step-button:hover,
.next-step-button:focus-visible {
  background: var(--paper);
  box-shadow: 4px 4px 0 var(--orange);
  transform: translate(-2px, -2px);
}

.demo-play span,
.next-step-button span {
  font-size: 1rem;
}

.demo-network.is-running .lab-flow,
.demo-network.is-running .lesson-node span {
  animation: signal-flash 900ms cubic-bezier(0.2, 0.8, 0.2, 1) 2;
}

.demo-bottombar {
  border-top: 1px solid var(--line-light);
  color: rgba(238, 242, 234, 0.38);
  font-size: 0.48rem;
}

.demo-bottombar span:first-child {
  align-items: center;
  display: flex;
  gap: 0.4rem;
}

.demo-bottombar i {
  background: var(--mint);
  border-radius: 50%;
  display: inline-block;
  height: 6px;
  width: 6px;
}

.layer-explainer {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.2rem;
}

.layer-card {
  background: rgba(11, 16, 20, 0.045);
  border-top: 2px solid var(--blue);
  min-height: 154px;
  padding: 0.95rem;
}

.layer-card:first-child { border-color: var(--mint); }
.layer-card:last-child { border-color: var(--orange); }

.layer-card > span {
  color: var(--text-muted);
  display: block;
  font-family: var(--mono);
  font-size: 0.47rem;
  letter-spacing: 0.08em;
  margin-bottom: 2.1rem;
  text-transform: uppercase;
}

.layer-card h4 {
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.06em;
  margin: 0;
}

.layer-card p {
  color: var(--text-muted);
  font-size: 0.64rem;
  line-height: 1.45;
  margin: 0.45rem 0 0;
}

.mini-filter-demo {
  align-items: flex-end;
  background: var(--ink);
  display: flex;
  gap: 0.18rem;
  height: 85px;
  margin-bottom: 1rem;
  padding: 0.8rem;
}

.mini-filter-demo span {
  background: var(--mint);
  display: block;
  height: 28%;
  opacity: 0.7;
  transition: height 350ms ease, opacity 350ms ease;
  width: 13%;
}

.mini-filter-demo span:nth-child(2) { height: 54%; }
.mini-filter-demo span:nth-child(3) { height: 76%; }
.mini-filter-demo span:nth-child(4) { height: 44%; }
.mini-filter-demo span:nth-child(5) { height: 89%; }
.mini-filter-demo span:nth-child(6) { height: 60%; }

.filter-microscope {
  align-items: center;
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  grid-template-columns: 112px minmax(0, 1fr);
  padding: 0.85rem 0;
}

.filter-microscope-copy span,
.filter-microscope-copy strong,
.filter-microscope-copy small {
  display: block;
}

.filter-microscope-copy span,
.filter-microscope-copy small {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.45rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.filter-microscope-copy strong {
  color: var(--ink);
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.06em;
  margin: 0.25rem 0;
}

.filter-microscope-copy small {
  color: var(--orange);
}

.filter-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.25rem;
}

.filter-button {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.5rem;
  padding: 0.62rem 0.75rem;
  text-transform: uppercase;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.is-selected {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--mint);
}

.filter-copy {
  color: var(--text-muted);
  font-size: 0.74rem;
  line-height: 1.65;
  margin: 1rem 0 0;
  max-width: 500px;
}

.builder-status {
  align-items: center;
  border-bottom: 1px solid var(--line-light);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding: 0.7rem 1rem;
}

.builder-status > span:first-child {
  align-items: center;
  display: flex;
  gap: 0.45rem;
}

.builder-status i {
  background: var(--builder-accent, var(--mint));
  border-radius: 50%;
  box-shadow: 0 0 11px var(--builder-accent, var(--mint));
  display: inline-block;
  height: 6px;
  width: 6px;
}

.builder-status strong,
.builder-status > span:last-child,
.builder-control-label,
.builder-layer-kicker,
.builder-layer-meta,
.builder-layer-signal,
.builder-inspector-top,
.builder-inspector-stats span,
.builder-activation-row,
.builder-input-label span,
.builder-input small,
.builder-note span {
  font-family: var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.builder-status strong,
.builder-status > span:last-child {
  color: var(--paper);
  font-size: 0.46rem;
  font-weight: 400;
}

.builder-status > span:last-child {
  color: rgba(238, 242, 234, 0.36);
  text-align: right;
}

.builder-visual {
  display: grid;
  grid-template-columns: minmax(0, 1.58fr) minmax(195px, 0.92fr);
}

.builder-diagram {
  background: radial-gradient(circle at 50% 48%, color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 82%), transparent 36%), linear-gradient(rgba(238, 242, 234, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.045) 1px, transparent 1px), #0d151b;
  background-size: auto, 36px 36px, 36px 36px, auto;
  min-height: 286px;
  overflow: hidden;
  position: relative;
}

.builder-diagram.is-refreshing .builder-layer,
.builder-diagram.is-refreshing #builder-signal-route {
  animation: builder-pop 450ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes builder-pop {
  from { opacity: 0.35; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.builder-diagram-label {
  color: rgba(238, 242, 234, 0.35);
  font-family: var(--mono);
  font-size: 0.4rem;
  letter-spacing: 0.08em;
  position: absolute;
  text-transform: uppercase;
  z-index: 4;
}

.builder-diagram-label.top { left: 0.8rem; top: 0.75rem; }
.builder-diagram-label.bottom { bottom: 0.65rem; right: 0.8rem; }
.builder-direction-narrow { display: none; }

.builder-links {
  height: 100%;
  inset: 0;
  overflow: visible;
  position: absolute;
  width: 100%;
  z-index: 1;
}

.builder-link {
  fill: none;
  stroke: rgba(238, 242, 234, 0.18);
  stroke-width: 1.05;
  transition: opacity 220ms ease, stroke 220ms ease, stroke-width 220ms ease;
}

.builder-link.is-hot {
  opacity: 0.8;
  stroke: var(--builder-accent, var(--mint));
  stroke-width: 1.6;
}

#builder-signal-route {
  fill: none;
  stroke: var(--builder-accent, var(--mint));
  stroke-dasharray: 5 11;
  stroke-linecap: round;
  stroke-width: 3;
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 42%));
  animation: builder-route 3s linear infinite;
}

@keyframes builder-route {
  to { stroke-dashoffset: -64; }
}

.builder-layers {
  align-items: stretch;
  display: flex;
  gap: 0.28rem;
  inset: 2.2rem 0.65rem 1.45rem;
  justify-content: space-between;
  position: absolute;
  z-index: 2;
}

.builder-layer {
  align-items: center;
  background: rgba(11, 16, 20, 0.78);
  border: 1px solid rgba(238, 242, 234, 0.13);
  color: var(--paper);
  display: flex;
  flex: 1 1 0;
  flex-direction: column;
  gap: 0.22rem;
  justify-content: center;
  min-width: 0;
  padding: 0.5rem 0.25rem;
  position: relative;
  text-align: center;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.builder-layer:hover,
.builder-layer:focus-visible,
.builder-layer.is-selected {
  background: rgba(11, 16, 20, 0.94);
  border-color: var(--builder-accent, var(--mint));
  transform: translateY(-3px);
}

.builder-layer-input { border-top-color: var(--mint); }
.builder-layer-output { border-top-color: var(--orange); }

.builder-layer-kicker,
.builder-layer-meta,
.builder-layer-signal {
  color: rgba(238, 242, 234, 0.38);
  display: block;
  font-size: 0.34rem;
  line-height: 1.2;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.builder-layer-name {
  color: var(--paper);
  display: block;
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.builder-layer-input .builder-layer-name { color: var(--mint); }
.builder-layer-output .builder-layer-name { color: var(--orange); }

.builder-node-stack {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.45rem;
  justify-content: center;
  margin: 0.55rem 0;
}

.builder-node-stack i {
  background: var(--builder-accent, var(--mint));
  border: 1px solid rgba(238, 242, 234, 0.62);
  border-radius: 50%;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 88%), 0 0 13px color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 35%);
  display: block;
  height: 10px;
  opacity: calc(0.22 + var(--activation) * 0.78);
  transition: opacity 260ms ease, transform 260ms ease;
  width: 10px;
}

.builder-layer-input .builder-node-stack i { background: var(--mint); }
.builder-layer-output .builder-node-stack i { background: var(--orange); }

.builder-layer-signal {
  color: var(--builder-accent, var(--mint));
}

.builder-layer-output .builder-layer-signal { color: var(--orange); }

.builder-inspector {
  background: rgba(238, 242, 234, 0.045);
  border-left: 1px solid var(--line-light);
  min-width: 0;
  padding: 1rem;
}

.builder-inspector-top {
  align-items: center;
  color: rgba(238, 242, 234, 0.4);
  display: flex;
  font-size: 0.41rem;
  justify-content: space-between;
}

.builder-inspector-top strong {
  color: var(--builder-accent, var(--mint));
  font-weight: 400;
}

.builder-inspector h4 {
  color: var(--paper);
  font-family: var(--display);
  font-size: 1.55rem;
  font-weight: 500;
  letter-spacing: -0.08em;
  line-height: 0.9;
  margin: 1.2rem 0 0;
}

.builder-inspector > p {
  color: rgba(238, 242, 234, 0.55);
  font-size: 0.61rem;
  line-height: 1.45;
  margin: 0.65rem 0 1rem;
}

.builder-inspector-stats {
  border-bottom: 1px solid var(--line-light);
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 0.65rem 0;
}

.builder-inspector-stats div {
  min-width: 0;
}

.builder-inspector-stats div + div {
  border-left: 1px solid var(--line-light);
  padding-left: 0.5rem;
}

.builder-inspector-stats span,
.builder-inspector-stats strong {
  display: block;
}

.builder-inspector-stats span {
  color: rgba(238, 242, 234, 0.35);
  font-size: 0.35rem;
  line-height: 1.25;
}

.builder-inspector-stats strong {
  color: var(--paper);
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: -0.05em;
  margin-top: 0.35rem;
  overflow-wrap: anywhere;
}

.builder-inspector-stats div:last-child strong { color: var(--builder-accent, var(--mint)); }

.builder-activation-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.builder-activation-row {
  align-items: center;
  color: rgba(238, 242, 234, 0.58);
  display: grid;
  font-size: 0.38rem;
  gap: 0.4rem;
  grid-template-columns: 3.8rem minmax(0, 1fr) 2rem;
}

.builder-activation-row b {
  color: var(--paper);
  font-weight: 400;
  text-align: right;
}

.builder-activation-track {
  background: rgba(238, 242, 234, 0.1);
  display: block;
  height: 4px;
  overflow: hidden;
}

.builder-activation-fill {
  background: var(--builder-accent, var(--mint));
  display: block;
  height: 100%;
}

.builder-controls {
  align-items: center;
  border-top: 1px solid var(--line-light);
  display: flex;
  gap: 1.1rem;
  justify-content: space-between;
  padding: 0.85rem 1rem;
}

.builder-control-group {
  align-items: center;
  display: flex;
  gap: 0.65rem;
  min-width: 0;
}

.builder-control-label {
  color: rgba(238, 242, 234, 0.4);
  flex: 0 0 auto;
  font-size: 0.42rem;
}

.builder-preset-row,
.builder-input-buttons {
  display: flex;
  gap: 0.3rem;
}

.builder-preset,
.builder-input {
  background: rgba(238, 242, 234, 0.04);
  border: 1px solid rgba(238, 242, 234, 0.13);
  color: rgba(238, 242, 234, 0.5);
  font-family: var(--mono);
  font-size: 0.4rem;
  padding: 0.55rem 0.58rem;
  text-transform: uppercase;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.builder-preset:hover,
.builder-preset:focus-visible,
.builder-preset.is-selected {
  background: color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 87%);
  border-color: var(--builder-accent, var(--mint));
  color: var(--paper);
}

.builder-depth-stepper {
  align-items: center;
  display: flex;
  gap: 0.45rem;
}

.builder-depth-stepper output {
  color: var(--builder-accent, var(--mint));
  font-family: var(--display);
  font-size: 1rem;
  min-width: 1.25rem;
  text-align: center;
}

.builder-stepper-button {
  align-items: center;
  background: transparent;
  border: 1px solid rgba(238, 242, 234, 0.2);
  color: var(--paper);
  display: inline-flex;
  font-family: var(--display);
  font-size: 1rem;
  height: 28px;
  justify-content: center;
  line-height: 1;
  padding: 0;
  width: 28px;
}

.builder-stepper-button:hover,
.builder-stepper-button:focus-visible {
  border-color: var(--builder-accent, var(--mint));
  color: var(--builder-accent, var(--mint));
}

.builder-stepper-button:disabled {
  cursor: not-allowed;
  opacity: 0.28;
}

.builder-input-picker {
  align-items: center;
  border-top: 1px solid var(--line-light);
  display: grid;
  gap: 1rem;
  grid-template-columns: 7.6rem minmax(0, 1fr);
  padding: 0.85rem 1rem;
}

.builder-input-label span,
.builder-input-label strong {
  display: block;
}

.builder-input-label span {
  color: rgba(238, 242, 234, 0.4);
  font-size: 0.4rem;
}

.builder-input-label strong {
  color: var(--builder-accent, var(--mint));
  font-family: var(--display);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: -0.05em;
  margin-top: 0.2rem;
}

.builder-input {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  text-align: left;
}

.builder-input span {
  color: var(--paper);
  font-family: var(--display);
  font-size: 0.68rem;
  letter-spacing: -0.04em;
}

.builder-input small {
  color: rgba(238, 242, 234, 0.36);
  font-size: 0.35rem;
}

.builder-input:hover,
.builder-input:focus-visible,
.builder-input.is-selected {
  background: color-mix(in srgb, var(--builder-accent, var(--mint)), transparent 87%);
  border-color: var(--builder-accent, var(--mint));
}

.builder-note {
  color: var(--text-muted);
  font-size: 0.68rem;
  line-height: 1.6;
  margin: 0.95rem 0 0;
  max-width: 570px;
}

.builder-note span {
  color: var(--orange);
  font-size: 0.42rem;
  margin-right: 0.45rem;
}

.gradient-lab-map {
  background: radial-gradient(circle at 48% 78%, rgba(255, 139, 103, 0.15), transparent 36%), linear-gradient(rgba(238, 242, 234, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 242, 234, 0.045) 1px, transparent 1px), #0d151b;
  background-size: auto, 43px 43px, 43px 43px, auto;
  min-height: 330px;
  overflow: hidden;
  position: relative;
}

.gradient-lab-map svg {
  height: 100%;
  overflow: visible;
  width: 100%;
}

.gradient-lab-map .lab-grid {
  fill: none;
  stroke: rgba(238, 242, 234, 0.08);
  stroke-width: 1;
}

.gradient-lab-map .lab-valley {
  fill: none;
  stroke: rgba(255, 139, 103, 0.75);
  stroke-dasharray: 2 8;
  stroke-width: 2;
}

.gradient-lab-map .lab-fill {
  fill: url(#gradientLessonFill);
}

.gradient-lab-map .lab-trail {
  fill: none;
  stroke: var(--orange);
  stroke-dasharray: 4 8;
  stroke-width: 2;
}

.gradient-lab-map .lab-dot-shadow,
.gradient-lab-map .lab-dot {
  transition: cx var(--dot-duration, 500ms) cubic-bezier(0.2, 0.8, 0.2, 1), cy var(--dot-duration, 500ms) cubic-bezier(0.2, 0.8, 0.2, 1), r var(--dot-duration, 500ms) ease;
}

.gradient-lab-map .lab-dot-shadow { fill: rgba(255, 139, 103, 0.18); }
.gradient-lab-map .lab-dot { fill: var(--orange); stroke: var(--paper); stroke-width: 2; }
.gradient-demo[data-rate-mode='chaos'] .gradient-lab-map .lab-dot { filter: drop-shadow(0 0 9px rgba(255, 139, 103, 0.7)); }
.gradient-demo[data-rate-mode='slow'] .gradient-lab-map .lab-dot { opacity: 0.76; }
.gradient-lab-map .lab-axis { fill: none; stroke: rgba(238, 242, 234, 0.35); stroke-width: 1; }

.gradient-lab-map .lab-tangent {
  fill: none;
  stroke: rgba(238, 242, 234, 0.58);
  stroke-dasharray: 4 6;
  stroke-width: 1.5;
  transition: x1 var(--dot-duration, 500ms) ease, y1 var(--dot-duration, 500ms) ease, x2 var(--dot-duration, 500ms) ease, y2 var(--dot-duration, 500ms) ease;
}

.gradient-lab-map .lab-slope-arrow {
  fill: none;
  stroke: var(--orange);
  stroke-linecap: round;
  stroke-width: 2;
  filter: drop-shadow(0 0 5px rgba(255, 139, 103, 0.48));
  transition: x1 var(--dot-duration, 500ms) ease, y1 var(--dot-duration, 500ms) ease, x2 var(--dot-duration, 500ms) ease, y2 var(--dot-duration, 500ms) ease;
}

.gradient-lab-map.is-remixing svg {
  animation: terrain-flash 720ms ease-out;
}

@keyframes terrain-flash {
  0% { filter: drop-shadow(0 0 0 rgba(255, 139, 103, 0)); opacity: 0.55; }
  45% { filter: drop-shadow(0 0 13px rgba(255, 139, 103, 0.45)); opacity: 1; }
  100% { filter: drop-shadow(0 0 0 rgba(255, 139, 103, 0)); opacity: 1; }
}

.gradient-map-label {
  color: rgba(238, 242, 234, 0.42);
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  position: absolute;
  text-transform: uppercase;
}

.gradient-map-label.top { left: 5%; top: 7%; }
.gradient-map-label.bottom { bottom: 7%; left: 5%; }
.gradient-map-label.minimum { bottom: 7%; color: var(--orange); left: 48%; }

.landscape-picker {
  align-items: center;
  border-top: 1px solid var(--line-light);
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr auto;
  padding: 0.85rem 1rem;
}

.landscape-picker-heading span,
.landscape-picker-heading strong {
  display: block;
}

.landscape-picker-heading span {
  color: rgba(238, 242, 234, 0.4);
  font-family: var(--mono);
  font-size: 0.45rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.landscape-picker-heading strong {
  color: var(--orange);
  font-family: var(--display);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: -0.05em;
  margin-top: 0.2rem;
}

.landscape-picker-buttons {
  display: flex;
  gap: 0.35rem;
}

.landscape-button {
  background: rgba(238, 242, 234, 0.04);
  border: 1px solid rgba(238, 242, 234, 0.13);
  color: rgba(238, 242, 234, 0.48);
  font-family: var(--mono);
  font-size: 0.46rem;
  padding: 0.55rem 0.62rem;
  text-transform: uppercase;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.landscape-button:hover,
.landscape-button:focus-visible,
.landscape-button.is-selected {
  background: rgba(255, 139, 103, 0.12);
  border-color: var(--orange);
  color: var(--paper);
  transform: translateY(-2px);
}

.gradient-stats {
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 0.85rem 1rem;
}

.gradient-stat + .gradient-stat {
  border-left: 1px solid var(--line-light);
  padding-left: 1rem;
}

.gradient-stat small,
.gradient-stat strong {
  display: block;
}

.gradient-stat small {
  color: rgba(238, 242, 234, 0.39);
  font-family: var(--mono);
  font-size: 0.47rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
}

.gradient-stat strong {
  color: var(--paper);
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.07em;
}

.gradient-stat strong i {
  color: rgba(238, 242, 234, 0.32);
  font-family: var(--mono);
  font-size: 0.49rem;
  font-style: normal;
}

.gradient-stat strong.is-down {
  color: var(--orange);
  font-size: 0.8rem;
}

.loss-compare {
  border-top: 1px solid var(--line-light);
  padding: 0.85rem 1rem 1rem;
}

.loss-compare-heading {
  align-items: baseline;
  display: flex;
  gap: 0.8rem;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.loss-compare-heading span,
.loss-compare-heading strong,
.loss-compare-row > span,
.loss-compare-row b {
  font-family: var(--mono);
  font-size: 0.44rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.loss-compare-heading span,
.loss-compare-row > span {
  color: rgba(238, 242, 234, 0.42);
}

.loss-compare-heading strong {
  color: var(--orange);
  font-weight: 400;
  text-align: right;
}

.loss-compare-row {
  align-items: center;
  display: grid;
  gap: 0.55rem;
  grid-template-columns: 4.8rem minmax(0, 1fr) 2.3rem;
  margin-top: 0.45rem;
}

.loss-compare-row b {
  color: var(--paper);
  font-weight: 400;
  text-align: right;
}

.loss-track {
  background: rgba(238, 242, 234, 0.1);
  display: block;
  height: 5px;
  overflow: hidden;
}

.loss-track i {
  background: var(--orange);
  display: block;
  height: 100%;
  transition: width 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
  width: 28%;
}

.loss-track.target i {
  background: rgba(238, 242, 234, 0.45);
}

.gradient-controls {
  align-items: flex-end;
  border-top: 1px solid var(--line-light);
  display: flex;
  gap: 1rem;
  padding: 1rem;
}

.gradient-range-label {
  display: block;
  flex: 1;
}

.gradient-range-label > span {
  align-items: center;
  color: rgba(238, 242, 234, 0.45);
  display: flex;
  font-family: var(--mono);
  font-size: 0.48rem;
  justify-content: space-between;
  letter-spacing: 0.08em;
  margin-bottom: 0.65rem;
  text-transform: uppercase;
}

.gradient-range-label output {
  color: var(--orange);
}

.gradient-range-label input[type='range'] {
  appearance: none;
  background: linear-gradient(90deg, var(--orange) 0%, rgba(238, 242, 234, 0.14) 0%);
  display: block;
  height: 2px;
  width: 100%;
}

.gradient-range-label input[type='range']::-webkit-slider-thumb {
  appearance: none;
  background: var(--orange);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--orange);
  height: 15px;
  width: 15px;
}

.gradient-range-label input[type='range']::-moz-range-thumb {
  background: var(--orange);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--orange);
  height: 11px;
  width: 11px;
}

.next-step-button {
  background: var(--orange);
  min-width: 150px;
}

.next-step-button:hover,
.next-step-button:focus-visible {
  box-shadow: 4px 4px 0 var(--blue);
}

.demo-bottombar.gradient-bottom {
  color: rgba(238, 242, 234, 0.38);
}

.demo-bottombar.gradient-bottom i {
  background: var(--orange);
}

.rate-card {
  background: var(--ink);
  color: var(--paper);
  margin-top: 1.25rem;
  padding: 1.25rem;
}

.rate-card-top {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.rate-card-top span {
  color: rgba(238, 242, 234, 0.44);
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rate-card-top strong {
  color: var(--orange);
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.08em;
}

.rate-track {
  background: rgba(238, 242, 234, 0.12);
  height: 7px;
  margin: 1.2rem 0 0.8rem;
  position: relative;
}

.rate-track span {
  background: linear-gradient(90deg, var(--orange), var(--mint));
  display: block;
  height: 100%;
  transition: width 300ms ease;
  width: 50%;
}

.rate-markers {
  color: rgba(238, 242, 234, 0.4);
  display: flex;
  font-family: var(--mono);
  font-size: 0.45rem;
  justify-content: space-between;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.rate-card input[type='range'] {
  appearance: none;
  background: linear-gradient(90deg, var(--mint) 50%, rgba(238, 242, 234, 0.14) 50%);
  display: block;
  height: 2px;
  margin-top: 0.9rem;
  width: 100%;
}

.rate-card input[type='range']::-webkit-slider-thumb {
  appearance: none;
  background: var(--mint);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--mint);
  height: 15px;
  width: 15px;
}

.rate-card input[type='range']::-moz-range-thumb {
  background: var(--mint);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--mint);
  height: 11px;
  width: 11px;
}

.rate-copy {
  color: rgba(238, 242, 234, 0.58);
  font-size: 0.67rem;
  line-height: 1.55;
  margin: 1rem 0 0;
}

.gradient-mechanism {
  --mechanism-accent: var(--orange);
}

.mechanism-flow {
  align-items: stretch;
  background: radial-gradient(circle at 50% 50%, rgba(255, 139, 103, 0.12), transparent 42%), #0d151b;
  border-bottom: 1px solid var(--line-light);
  display: grid;
  gap: 0.45rem;
  grid-template-columns: minmax(70px, 1fr) 1rem minmax(84px, 1.15fr) 1rem minmax(84px, 1.15fr) 1rem minmax(80px, 1fr);
  padding: 1rem;
}

.mechanism-node {
  align-items: flex-start;
  background: rgba(238, 242, 234, 0.045);
  border: 1px solid rgba(238, 242, 234, 0.16);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 92px;
  padding: 0.72rem;
}

.mechanism-node span,
.mechanism-node strong,
.mechanism-node small {
  display: block;
}

.mechanism-node span {
  color: rgba(238, 242, 234, 0.42);
  font-family: var(--mono);
  font-size: 0.43rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mechanism-node strong {
  color: var(--paper);
  font-family: var(--display);
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.1em;
  line-height: 1;
  margin: 0.55rem 0 0.38rem;
}

.mechanism-node small {
  color: rgba(238, 242, 234, 0.52);
  font-size: 0.55rem;
  line-height: 1.35;
}

.mechanism-node-weight {
  background: rgba(255, 139, 103, 0.1);
  border-color: rgba(255, 139, 103, 0.7);
}

.mechanism-node-weight strong,
.mechanism-node-target strong {
  color: var(--orange);
}

.mechanism-node-target {
  background: rgba(185, 255, 85, 0.07);
  border-color: rgba(185, 255, 85, 0.44);
}

.mechanism-node-target strong {
  color: var(--mint);
}

.mechanism-operator {
  align-self: center;
  color: var(--orange);
  font-family: var(--display);
  font-size: 1.35rem;
  text-align: center;
}

.mechanism-compare {
  color: var(--mint);
}

.mechanism-visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
}

.mechanism-comparison,
.mechanism-parameter {
  padding: 1rem;
}

.mechanism-comparison {
  border-right: 1px solid var(--line-light);
}

.mechanism-panel-heading {
  align-items: baseline;
  display: flex;
  gap: 0.6rem;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.mechanism-panel-heading span,
.mechanism-panel-heading strong,
.mechanism-bar-row > span,
.mechanism-bar-row b,
.parameter-axis,
.parameter-zone,
.parameter-marker span,
.parameter-arrow span {
  font-family: var(--mono);
  font-size: 0.44rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mechanism-panel-heading span,
.mechanism-bar-row > span {
  color: rgba(238, 242, 234, 0.42);
}

.mechanism-panel-heading strong {
  color: var(--orange);
  font-weight: 400;
  text-align: right;
}

.mechanism-bar-row {
  align-items: center;
  display: grid;
  gap: 0.55rem;
  grid-template-columns: 4.5rem minmax(0, 1fr) 2.1rem;
  margin-top: 0.65rem;
}

.mechanism-bar-row b {
  color: var(--paper);
  font-weight: 400;
  text-align: right;
}

.mechanism-bar-track {
  background: rgba(238, 242, 234, 0.1);
  height: 6px;
  overflow: hidden;
}

.mechanism-bar-track i {
  background: var(--orange);
  display: block;
  height: 100%;
  transition: width 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
  width: 20%;
}

.mechanism-bar-row.target .mechanism-bar-track i {
  background: var(--mint);
  width: 80%;
}

.mechanism-comparison p {
  color: rgba(238, 242, 234, 0.55);
  font-size: 0.62rem;
  line-height: 1.55;
  margin: 1.25rem 0 0;
  max-width: 280px;
}

.mechanism-parameter {
  min-width: 0;
}

.parameter-map {
  background: linear-gradient(rgba(238, 242, 234, 0.05) 1px, transparent 1px), radial-gradient(circle at 50% 70%, rgba(255, 139, 103, 0.13), transparent 46%), #0d151b;
  background-size: 100% 28px, auto, auto;
  height: 150px;
  overflow: hidden;
  position: relative;
}

.parameter-zone {
  color: rgba(238, 242, 234, 0.3);
  position: absolute;
  top: 0.65rem;
}

.parameter-zone.low { left: 6%; }
.parameter-zone.high { right: 6%; }

.parameter-axis {
  bottom: 0.55rem;
  color: rgba(238, 242, 234, 0.34);
  display: flex;
  justify-content: space-between;
  left: 7%;
  position: absolute;
  right: 7%;
}

.parameter-track {
  background: rgba(238, 242, 234, 0.25);
  height: 2px;
  left: 7%;
  position: absolute;
  right: 7%;
  top: 67%;
}

.parameter-track::before,
.parameter-track::after {
  background: rgba(238, 242, 234, 0.45);
  content: '';
  height: 9px;
  position: absolute;
  top: -3px;
  width: 1px;
}

.parameter-track::before { left: 0; }
.parameter-track::after { right: 0; }

.parameter-marker {
  left: var(--marker-position, 20%);
  position: absolute;
  top: 47%;
  transform: translateX(-50%);
  transition: left 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 2;
}

.parameter-marker i {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--paper);
  display: block;
  height: 11px;
  margin: 0 auto;
  width: 11px;
}

.parameter-marker span {
  color: var(--paper);
  display: block;
  margin-top: 0.45rem;
  position: relative;
  text-align: center;
  transform: translateX(-50%);
  white-space: nowrap;
}

.parameter-marker b,
.parameter-arrow b {
  color: var(--orange);
  font-weight: 400;
}

.parameter-marker-target {
  --marker-position: 61.5%;
  top: 24%;
}

.parameter-marker-target i {
  background: var(--mint);
  box-shadow: 0 0 0 1px var(--mint), 0 0 14px rgba(185, 255, 85, 0.38);
}

.parameter-marker-target span {
  color: var(--mint);
  margin-top: 0.35rem;
}

.parameter-marker-next {
  top: 70%;
}

.parameter-marker-next i {
  background: var(--orange);
  box-shadow: 0 0 0 1px var(--orange), 0 0 14px rgba(255, 139, 103, 0.4);
}

.parameter-arrow {
  border-top: 1px dashed var(--orange);
  left: var(--arrow-start, 20%);
  position: absolute;
  top: 38%;
  transition: left 320ms ease, width 320ms ease;
  width: var(--arrow-width, 20%);
}

.parameter-arrow::after {
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--orange);
  border-top: 4px solid transparent;
  content: '';
  position: absolute;
  right: -1px;
  top: -5px;
}

.parameter-arrow.is-left::after {
  left: -1px;
  right: auto;
  transform: rotate(180deg);
}

.parameter-arrow span {
  color: var(--orange);
  display: block;
  left: 50%;
  position: absolute;
  text-align: center;
  top: -1.05rem;
  transform: translateX(-50%);
  white-space: nowrap;
}

.mechanism-readouts {
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mechanism-readouts > div {
  padding: 0.85rem 1rem;
}

.mechanism-readouts > div + div {
  border-left: 1px solid var(--line-light);
}

.mechanism-readouts span,
.mechanism-readouts strong,
.mechanism-readouts small {
  display: block;
}

.mechanism-readouts span,
.mechanism-readouts small {
  color: rgba(238, 242, 234, 0.4);
  font-family: var(--mono);
  font-size: 0.42rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mechanism-readouts strong {
  color: var(--orange);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.08em;
  margin: 0.42rem 0 0.28rem;
}

.mechanism-readouts small {
  color: rgba(238, 242, 234, 0.52);
  letter-spacing: 0;
  text-transform: none;
}

.mechanism-formula {
  border-top: 1px solid var(--line-light);
  color: var(--mint);
  font-family: var(--mono);
  font-size: 0.55rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
  padding: 0.8rem 1rem;
}

.mechanism-controls {
  align-items: end;
  border-top: 1px solid var(--line-light);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(210px, 1.3fr) minmax(150px, 0.8fr) auto;
  padding: 1rem;
}

.mechanism-control-label,
.mechanism-range-label > span,
.rate-quick-pick span {
  color: rgba(238, 242, 234, 0.42);
  display: flex;
  font-family: var(--mono);
  font-size: 0.44rem;
  justify-content: space-between;
  letter-spacing: 0.07em;
  margin-bottom: 0.55rem;
  text-transform: uppercase;
}

.mechanism-scenarios {
  display: grid;
  gap: 0.3rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mechanism-scenario {
  background: rgba(238, 242, 234, 0.04);
  border: 1px solid rgba(238, 242, 234, 0.14);
  color: rgba(238, 242, 234, 0.58);
  min-width: 0;
  padding: 0.48rem 0.4rem;
  text-align: left;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.mechanism-scenario span,
.mechanism-scenario small {
  display: block;
}

.mechanism-scenario span {
  font-family: var(--mono);
  font-size: 0.43rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.mechanism-scenario small {
  color: rgba(238, 242, 234, 0.38);
  font-size: 0.48rem;
  margin-top: 0.35rem;
}

.mechanism-scenario:hover,
.mechanism-scenario:focus-visible,
.mechanism-scenario.is-selected {
  background: rgba(255, 139, 103, 0.1);
  border-color: var(--orange);
  color: var(--paper);
  transform: translateY(-2px);
}

.mechanism-range-label {
  display: block;
}

.mechanism-range-label output {
  color: var(--orange);
}

.mechanism-range-label input[type='range'] {
  appearance: none;
  background: linear-gradient(90deg, var(--orange) 15.4%, rgba(238, 242, 234, 0.14) 15.4%);
  display: block;
  height: 2px;
  width: 100%;
}

.mechanism-range-label input[type='range']::-webkit-slider-thumb {
  appearance: none;
  background: var(--orange);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--orange);
  height: 15px;
  width: 15px;
}

.mechanism-range-label input[type='range']::-moz-range-thumb {
  background: var(--orange);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--orange);
  height: 11px;
  width: 11px;
}

.mechanism-step-button {
  min-width: 175px;
}

.rate-lab {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.rate-lab .rate-card {
  margin-top: 0;
}

.rate-quick-pick {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 1rem;
}

.rate-quick-pick span {
  margin: 0 0.35rem 0 0;
}

.rate-quick-pick button {
  background: rgba(238, 242, 234, 0.05);
  border: 1px solid rgba(238, 242, 234, 0.15);
  color: rgba(238, 242, 234, 0.58);
  font-family: var(--mono);
  font-size: 0.43rem;
  padding: 0.46rem 0.5rem;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.rate-quick-pick button:hover,
.rate-quick-pick button:focus-visible {
  background: rgba(185, 255, 85, 0.1);
  border-color: var(--mint);
  color: var(--paper);
  transform: translateY(-2px);
}

.rate-simulator {
  background: rgba(18, 26, 32, 0.78);
  border: 1px solid var(--line-light);
  padding: 1rem;
}

.rate-simulator-heading {
  align-items: baseline;
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
}

.rate-simulator-heading span,
.rate-simulator-heading strong,
.rate-path-top b,
.rate-path-top strong,
.rate-path-bottom small,
.rate-path-bottom b,
.rate-insight-grid span,
.rate-insight-grid strong {
  font-family: var(--mono);
  font-size: 0.44rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.rate-simulator-heading span,
.rate-path-bottom small,
.rate-insight-grid span {
  color: rgba(238, 242, 234, 0.42);
}

.rate-simulator-heading strong {
  color: var(--mint);
  font-weight: 400;
  text-align: right;
}

.rate-path-grid {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0.9rem;
}

.rate-path-card {
  background: rgba(238, 242, 234, 0.035);
  border: 1px solid rgba(238, 242, 234, 0.14);
  color: var(--paper);
  min-width: 0;
  padding: 0.7rem;
  text-align: left;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.rate-path-card:hover,
.rate-path-card:focus-visible,
.rate-path-card.is-active {
  background: rgba(185, 255, 85, 0.07);
  border-color: var(--mint);
  transform: translateY(-3px);
}

.rate-path-card[data-rate-preset='90']:hover,
.rate-path-card[data-rate-preset='90']:focus-visible,
.rate-path-card[data-rate-preset='90'].is-active {
  background: rgba(255, 139, 103, 0.08);
  border-color: var(--orange);
}

.rate-path-top,
.rate-path-bottom {
  align-items: baseline;
  display: flex;
  justify-content: space-between;
}

.rate-path-top b {
  color: var(--paper);
  font-weight: 400;
}

.rate-path-card[data-rate-preset='12'] .rate-path-top b { color: var(--blue); }
.rate-path-card[data-rate-preset='50'] .rate-path-top b { color: var(--mint); }
.rate-path-card[data-rate-preset='90'] .rate-path-top b { color: var(--orange); }

.rate-path-top strong {
  color: rgba(238, 242, 234, 0.6);
  font-weight: 400;
}

.rate-path-card svg {
  display: block;
  height: auto;
  margin: 0.75rem 0 0.55rem;
  overflow: visible;
  width: 100%;
}

.rate-grid {
  fill: none;
  stroke: rgba(238, 242, 234, 0.09);
  stroke-width: 1;
}

.rate-surface {
  fill: none;
  stroke: rgba(255, 139, 103, 0.55);
  stroke-dasharray: 2 7;
  stroke-width: 1.5;
}

.rate-trace {
  fill: none;
  stroke: var(--mint);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.rate-path-card[data-rate-preset='12'] .rate-trace { stroke: var(--blue); }
.rate-path-card[data-rate-preset='90'] .rate-trace { stroke: var(--orange); }

.rate-dot {
  fill: var(--mint);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.rate-path-card[data-rate-preset='12'] .rate-dot { fill: var(--blue); }
.rate-path-card[data-rate-preset='90'] .rate-dot { fill: var(--orange); }

.rate-dot.is-last {
  filter: drop-shadow(0 0 5px currentColor);
  r: 4.4;
}

.rate-path-bottom b {
  color: var(--paper);
  font-weight: 400;
}

.rate-insight-grid {
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0.9rem;
}

.rate-insight-grid > div {
  padding: 0.8rem 0.65rem 0.1rem;
}

.rate-insight-grid > div + div {
  border-left: 1px solid var(--line-light);
}

.rate-insight-grid strong {
  color: var(--paper);
  display: block;
  font-weight: 400;
  line-height: 1.45;
  margin-top: 0.42rem;
  text-transform: none;
}

.lesson-quote {
  border-left: 3px solid var(--orange);
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.65rem, 3.3vw, 3.2rem);
  letter-spacing: -0.08em;
  line-height: 1.05;
  margin: 2.5rem auto 0;
  max-width: var(--max);
  padding-left: clamp(1rem, 2vw, 1.8rem);
}

.dark-section .lesson-quote {
  color: var(--paper);
  border-color: var(--mint);
}

.lesson-quote em {
  color: var(--orange);
  font-style: normal;
}

.dark-section .lesson-quote em {
  color: var(--mint);
}

.lesson-quiz-section {
  background: var(--orange);
  padding: clamp(4.5rem, 8vw, 7rem) clamp(1.25rem, 7vw, 8.5rem);
}

.gradient-page .lesson-quiz-section {
  background: var(--blue);
}

.lesson-quiz {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 0.75fr) minmax(280px, 1.25fr);
  margin: 0 auto;
  max-width: var(--max);
}

.quiz-kicker {
  color: rgba(11, 16, 20, 0.58);
  display: block;
  font-size: 0.5rem;
  margin-bottom: 1rem;
}

.lesson-quiz h2 {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(2.7rem, 5vw, 5.3rem);
  font-weight: 600;
  letter-spacing: -0.1em;
  line-height: 0.84;
  margin: 0;
  text-transform: uppercase;
}

.quiz-prompt {
  align-self: center;
}

.quiz-prompt > p {
  color: rgba(11, 16, 20, 0.7);
  font-size: 0.84rem;
  line-height: 1.6;
  margin: 0 0 1rem;
}

.quiz-options {
  display: grid;
  gap: 0.55rem;
}

.quiz-option {
  align-items: center;
  background: rgba(11, 16, 20, 0.07);
  border: 1px solid rgba(11, 16, 20, 0.23);
  color: var(--ink);
  display: flex;
  font-size: 0.54rem;
  gap: 0.75rem;
  padding: 0.85rem;
  text-align: left;
  text-transform: none;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.quiz-option:hover,
.quiz-option:focus-visible {
  background: var(--ink);
  color: var(--paper);
  transform: translateX(4px);
}

.quiz-option.is-correct {
  background: var(--mint);
  border-color: var(--ink);
}

.quiz-option.is-wrong {
  background: rgba(238, 242, 234, 0.5);
}

.quiz-option span {
  align-items: center;
  border: 1px solid currentColor;
  display: inline-flex;
  flex: 0 0 22px;
  font-size: 0.48rem;
  height: 22px;
  justify-content: center;
}

.quiz-feedback {
  color: rgba(11, 16, 20, 0.7);
  font-size: 0.48rem;
  letter-spacing: 0.07em;
  line-height: 1.5;
  margin: 0.8rem 0 0;
}

.lesson-next {
  align-items: center;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  gap: 2rem;
  justify-content: space-between;
  padding: clamp(2.1rem, 5vw, 4rem) clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-next-copy {
  align-items: center;
  display: flex;
  gap: 1rem;
  max-width: 100%;
  min-width: 0;
}

.lesson-next-index {
  color: var(--orange);
  font-size: 0.54rem;
}

.lesson-next-label {
  color: rgba(238, 242, 234, 0.42);
  font-size: 0.48rem;
}

.lesson-next h2 {
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.1em;
  line-height: 0.83;
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
  text-transform: uppercase;
}

.lesson-next h2 em {
  color: var(--mint);
  font-style: normal;
}

.lesson-next-link {
  align-items: center;
  background: var(--mint);
  color: var(--ink);
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.55rem;
  gap: 1rem;
  padding: 1rem;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.lesson-next-link:hover,
.lesson-next-link:focus-visible {
  background: var(--paper);
  box-shadow: 5px 5px 0 var(--orange);
  transform: translate(-2px, -2px);
}

.lesson-page .site-footer {
  position: relative;
}

@media (max-width: 1300px) {
  .lesson-hero {
    gap: clamp(2rem, 4vw, 4rem);
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .lesson-hero h1 {
    font-size: clamp(4.4rem, 6.6vw, 7rem);
  }

  .walkthrough-intro h2 {
    font-size: clamp(2.8rem, 4.8vw, 5.2rem);
  }
}

@media (max-width: 1080px) {
  .lesson-hero {
    display: block;
    min-height: 0;
    padding-bottom: 5.8rem;
  }

  .lesson-hero-art {
    margin: 4rem auto 0;
    max-width: 680px;
  }

  .walkthrough-section {
    grid-template-columns: 1fr;
  }

  .walkthrough-intro {
    max-width: 600px;
    min-width: 0;
  }

  .walkthrough-intro > p:last-child {
    max-width: 420px;
  }

  .lesson-quiz {
    grid-template-columns: 1fr;
  }

  .quiz-prompt {
    max-width: 520px;
  }
}

@media (max-width: 620px) {
  .lesson-progress {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-progress-inner {
    gap: 0.6rem;
  }

  .lesson-progress-state {
    font-size: 0.42rem;
  }

  .lesson-progress-track {
    max-width: none;
  }

  .lesson-hero {
    padding-left: 1rem;
    padding-right: 1rem;
    padding-top: 3rem;
  }

  .lesson-back {
    margin-bottom: 3.2rem;
  }

  .lesson-hero h1 {
    font-size: clamp(3.4rem, 16.5vw, 5.7rem);
    max-width: 100%;
  }

  .lesson-hero h1 span,
  .lesson-hero h1 em {
    display: inline-block;
    max-width: 100%;
    overflow-wrap: anywhere;
  }

  html[lang="de"] .lesson-hero h1 {
    font-size: clamp(3rem, 13.2vw, 5rem);
  }

  .lesson-dek {
    font-size: 0.8rem;
  }

  .lesson-hero-art {
    min-height: 315px;
    margin-top: 3.2rem;
  }

  .hero-art-window {
    left: 0;
    right: 0;
  }

  .hero-art-map {
    min-height: 230px;
  }

  .hero-art-top,
  .hero-art-bottom {
    min-height: 35px;
    padding-left: 0.7rem;
    padding-right: 0.7rem;
  }

  .hero-art-top,
  .hero-art-bottom,
  .hero-art-label,
  .lesson-art-note {
    font-size: 0.4rem;
  }

  .lesson-intro-strip {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.55rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-intro-strip strong {
    font-size: 1.05rem;
  }

  .lesson-intro-strip span {
    font-size: 0.43rem;
  }

  .lesson-content-section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-overview {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .overview-cards,
  .overview-details,
  .overview-flow-list {
    grid-template-columns: 1fr;
  }

  .overview-card,
  .overview-detail {
    padding: 0.9rem;
  }

  .overview-card h3,
  .overview-detail h3 {
    font-size: 1.35rem;
  }

  .overview-card p,
  .overview-detail p {
    font-size: 0.68rem;
  }

  .overview-flow {
    padding: 0.9rem;
  }

  .overview-flow-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
  }

  .overview-flow-heading strong {
    font-size: 1.2rem;
  }

  .overview-flow-step {
    padding: 0.9rem 0 0.1rem;
  }

  .overview-flow-step + .overview-flow-step {
    border-left: 0;
    border-top: 1px solid var(--line-light);
    margin-top: 0.15rem;
    padding-left: 0;
  }

  .overview-flow-step:first-child {
    padding-top: 0.8rem;
  }

  .overview-flow-step p {
    font-size: 0.65rem;
  }

  .overview-cta {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.6rem;
    padding: 0.9rem;
  }

  .overview-cta strong {
    font-size: 1.05rem;
    text-align: left;
  }

  .walkthrough-intro h2 {
    font-size: clamp(2.65rem, 14vw, 4.5rem);
  }

  .walkthrough-intro > p:last-child,
  .walkthrough-body > .body-lede {
    font-size: 0.75rem;
  }

  .walkthrough-intro > p:last-child {
    max-width: 100%;
  }

  .lesson-demo {
    margin-left: -0.05rem;
    margin-right: -0.05rem;
  }

  .demo-topbar,
  .demo-bottombar {
    min-height: 43px;
    padding-left: 0.7rem;
    padding-right: 0.7rem;
  }

  .demo-topbar {
    min-height: 0;
    padding-bottom: 0.65rem;
    padding-top: 0.65rem;
  }

  .demo-actions {
    justify-content: flex-end;
    width: 100%;
  }

  .demo-network-map {
    aspect-ratio: auto;
    height: 185px;
    min-height: 0;
  }

  .lesson-map-label,
  .demo-index,
  .demo-action,
  .demo-note {
    font-size: 0.4rem;
  }

  .lesson-node {
    height: 26px;
    width: 26px;
  }

  .lesson-node span {
    height: 9px;
    width: 9px;
  }

  .lesson-node[data-node='output'] span {
    height: 13px;
    width: 13px;
  }

  .demo-network-readout {
    min-height: 73px;
    padding: 0.7rem;
  }

  .readout-symbol {
    flex-basis: 25px;
    font-size: 1rem;
    height: 25px;
  }

  .demo-network-readout span {
    font-size: 0.39rem;
  }

  .demo-network-readout strong {
    font-size: 0.82rem;
  }

  .demo-network-readout p {
    font-size: 0.54rem;
  }

  .network-insight-row {
    grid-template-columns: 1fr;
  }

  .feature-inspector {
    border-bottom: 1px solid var(--line-light);
    border-right: 0;
  }

  .feature-inspector,
  .prediction-panel {
    padding: 0.7rem;
  }

  .feature-matrix {
    min-height: 52px;
  }

  .filter-microscope {
    gap: 0.75rem;
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .filter-microscope-copy strong {
    font-size: 0.86rem;
  }

  .builder-status {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .builder-status > span:last-child {
    text-align: left;
  }

  .builder-visual {
    grid-template-columns: 1fr;
  }

  .builder-diagram {
    min-height: 0;
    padding: 2.4rem 0.7rem 1.3rem;
  }

  .builder-diagram-label.bottom {
    bottom: 0.65rem;
  }

  .builder-direction-wide { display: none; }
  .builder-direction-narrow { display: inline; }

  .builder-links {
    display: none;
  }

  .builder-layers {
    display: grid;
    gap: 0.75rem;
    inset: auto;
    position: relative;
  }

  .builder-layer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    min-height: 70px;
    padding: 0.65rem 0.7rem;
    text-align: left;
  }

  .builder-layer::before {
    color: var(--builder-accent, var(--mint));
    content: '↓';
    font-family: var(--display);
    font-size: 0.9rem;
    left: 50%;
    position: absolute;
    top: -0.74rem;
    transform: translateX(-50%);
  }

  .builder-layer:first-child::before {
    content: '';
  }

  .builder-layer-kicker {
    align-self: end;
    grid-column: 1;
    grid-row: 1;
  }

  .builder-layer-name {
    align-self: start;
    grid-column: 1;
    grid-row: 2;
  }

  .builder-node-stack {
    align-items: center;
    grid-column: 2;
    grid-row: 1 / 3;
    margin: 0 0.7rem;
  }

  .builder-layer-meta,
  .builder-layer-signal {
    grid-column: 3;
    text-align: right;
  }

  .builder-layer-meta { grid-row: 1; }
  .builder-layer-signal { align-self: start; grid-row: 2; }

  .builder-inspector {
    border-left: 0;
    border-top: 1px solid var(--line-light);
    padding: 0.85rem 0.7rem;
  }

  .builder-inspector h4 {
    margin-top: 0.9rem;
  }

  .builder-controls {
    align-items: stretch;
    flex-direction: column;
    gap: 0.8rem;
    padding: 0.7rem;
  }

  .builder-control-group {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
  }

  .builder-preset-row,
  .builder-depth-stepper {
    width: 100%;
  }

  .builder-preset {
    flex: 1;
    min-width: 0;
  }

  .builder-depth-stepper {
    justify-content: space-between;
  }

  .builder-input-picker {
    align-items: stretch;
    grid-template-columns: 1fr;
    padding: 0.7rem;
  }

  .builder-input-label {
    align-items: baseline;
    display: flex;
    justify-content: space-between;
  }

  .builder-input-buttons {
    width: 100%;
  }

  .builder-input {
    flex: 1;
  }

  .builder-note {
    font-size: 0.64rem;
  }

  .mechanism-flow {
    gap: 0.25rem;
    grid-template-columns: 1fr;
    padding: 0.7rem;
  }

  .mechanism-node {
    min-height: 72px;
    padding: 0.65rem 0.7rem;
  }

  .mechanism-node strong {
    font-size: 1.45rem;
    margin: 0.35rem 0 0.25rem;
  }

  .mechanism-operator {
    font-size: 1rem;
    height: 1rem;
    line-height: 1rem;
    transform: rotate(90deg);
  }

  .mechanism-visual-grid {
    grid-template-columns: 1fr;
  }

  .mechanism-comparison {
    border-bottom: 1px solid var(--line-light);
    border-right: 0;
  }

  .mechanism-comparison,
  .mechanism-parameter {
    padding: 0.75rem 0.7rem;
  }

  .mechanism-bar-row {
    grid-template-columns: 4.3rem minmax(0, 1fr) 2rem;
  }

  .parameter-map {
    height: 158px;
  }

  .parameter-marker span,
  .parameter-arrow span,
  .parameter-axis,
  .parameter-zone {
    font-size: 0.4rem;
  }

  .mechanism-readouts > div {
    padding: 0.75rem 0.55rem;
  }

  .mechanism-readouts span,
  .mechanism-readouts small {
    font-size: 0.37rem;
  }

  .mechanism-readouts strong {
    font-size: 1rem;
  }

  .mechanism-formula {
    font-size: 0.43rem;
    padding-left: 0.7rem;
    padding-right: 0.7rem;
  }

  .mechanism-controls {
    align-items: stretch;
    grid-template-columns: 1fr;
    padding: 0.7rem;
  }

  .mechanism-step-button {
    min-width: 0;
    width: 100%;
  }

  .rate-quick-pick {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rate-quick-pick span {
    grid-column: 1 / -1;
    margin: 0;
  }

  .rate-quick-pick button {
    min-width: 0;
    padding-left: 0.2rem;
    padding-right: 0.2rem;
  }

  .rate-simulator {
    padding: 0.7rem;
  }

  .rate-simulator-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.4rem;
  }

  .rate-simulator-heading strong {
    text-align: left;
  }

  .rate-path-grid,
  .rate-insight-grid {
    grid-template-columns: 1fr;
  }

  .rate-path-card {
    padding: 0.7rem;
  }

  .rate-insight-grid > div {
    padding: 0.7rem 0 0.1rem;
  }

  .rate-insight-grid > div + div {
    border-left: 0;
    border-top: 1px solid var(--line-light);
  }

  .demo-controls,
  .gradient-controls {
    align-items: stretch;
    flex-direction: column;
    padding: 0.7rem;
  }

  .choice-row {
    width: 100%;
  }

  .network-action-stack {
    flex-basis: auto;
    width: 100%;
  }

  .input-choice {
    min-height: 58px;
    padding: 0.5rem;
  }

  .input-choice strong {
    font-size: 0.63rem;
  }

  .input-choice small {
    font-size: 0.41rem;
  }

  .demo-play,
  .next-step-button {
    justify-content: space-between;
    min-height: 41px;
    width: 100%;
  }

  .layer-explainer {
    grid-template-columns: 1fr;
  }

  .layer-card {
    min-height: 0;
  }

  .layer-card > span {
    margin-bottom: 1rem;
  }

  .gradient-lab-map {
    min-height: 210px;
  }

  .gradient-stats {
    column-gap: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 0.75rem;
  }

  .gradient-stat:nth-child(3),
  .gradient-stat:nth-child(4) {
    border-top: 1px solid var(--line-light);
    padding-top: 0.75rem;
  }

  .gradient-stat:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }

  .landscape-picker {
    align-items: stretch;
    grid-template-columns: 1fr;
    padding: 0.75rem 0.7rem;
  }

  .landscape-picker-buttons {
    width: 100%;
  }

  .landscape-button {
    flex: 1;
  }

  .gradient-map-label,
  .gradient-stat small,
  .gradient-range-label > span {
    font-size: 0.4rem;
  }

  .gradient-stat strong {
    font-size: 0.94rem;
  }

  .gradient-stat strong.is-down {
    font-size: 0.65rem;
  }

  .rate-card {
    padding: 1rem;
  }

  .lesson-quote {
    font-size: 1.45rem;
  }

  .lesson-quiz-section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-quiz h2 {
    font-size: clamp(2.8rem, 14vw, 4.2rem);
  }

  .quiz-prompt > p {
    font-size: 0.76rem;
  }

  .quiz-option {
    font-size: 0.48rem;
  }

  .lesson-next {
    align-items: flex-start;
    flex-direction: column;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-next-copy {
    width: 100%;
  }

  .lesson-next h2 {
    font-size: 2.9rem;
  }

  .lesson-next-link {
    width: 100%;
  }
}

@media (max-width: 380px) {
  .choice-row {
    grid-template-columns: 1fr;
  }

  .input-choice {
    min-height: 52px;
  }

  .gradient-stats {
    gap: 0.8rem 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gradient-stat:nth-child(3),
  .gradient-stat:nth-child(4) {
    border-left: 0;
    border-top: 1px solid var(--line-light);
    padding-left: 0;
    padding-top: 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Search-friendly answers that still feel like part of the field guide. */
.lesson-faq-section {
  background: var(--paper-deep);
  border-top: 1px solid var(--line);
  padding: clamp(4rem, 7vw, 6.5rem) clamp(1.25rem, 7vw, 8.5rem);
}

.lesson-faq-section .walkthrough-section {
  align-items: start;
}

.lesson-faq-intro {
  max-width: 370px;
}

.lesson-faq-intro h2 {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(3rem, 5.5vw, 6rem);
  font-weight: 600;
  letter-spacing: -0.1em;
  line-height: 0.82;
  margin: 0;
  overflow-wrap: anywhere;
  text-transform: uppercase;
}

.lesson-faq-intro h2 em {
  color: var(--orange);
  font-style: normal;
}

.lesson-faq-intro > p:not(.lesson-faq-meta) {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.75;
  margin: 2rem 0 0;
  max-width: 290px;
}

.lesson-faq-meta {
  color: var(--text-muted);
  font: 0.48rem/1.6 var(--mono);
  letter-spacing: 0.08em;
  margin: 1.35rem 0 0;
  text-transform: uppercase;
}

.lesson-faq-meta time {
  color: var(--ink);
}

.lesson-faq-list {
  border-top: 1px solid var(--line);
}

.lesson-faq-item {
  border-bottom: 1px solid var(--line);
}

.lesson-faq-item summary {
  align-items: center;
  cursor: pointer;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  list-style: none;
  min-height: 88px;
  padding: 1rem 0;
}

.lesson-faq-item summary::-webkit-details-marker {
  display: none;
}

.lesson-faq-item summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.lesson-faq-item summary span {
  color: var(--text-muted);
  flex: 0 0 98px;
  font: 0.48rem var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-faq-item summary strong {
  color: var(--ink);
  flex: 1;
  font: 600 clamp(1.15rem, 2vw, 1.7rem)/1.05 var(--display);
  letter-spacing: -0.06em;
}

.lesson-faq-item summary::after {
  color: var(--orange);
  content: '+';
  flex: 0 0 26px;
  font: 1.5rem/1 var(--display);
  text-align: right;
}

.lesson-faq-item[open] summary::after {
  color: var(--blue);
  content: '−';
}

.lesson-faq-answer {
  border-left: 2px solid var(--mint);
  margin: 0 2.6rem 1.25rem 6.1rem;
  max-width: 640px;
  padding: 0.15rem 0 0.15rem 1rem;
}

.lesson-faq-answer p {
  color: var(--text-muted);
  font-size: 0.73rem;
  line-height: 1.75;
  margin: 0;
}

@media (max-width: 620px) {
  .lesson-faq-section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .lesson-faq-item summary {
    align-items: flex-start;
    gap: 0.45rem;
    padding: 1rem 0;
  }

  .lesson-faq-item summary span {
    flex-basis: auto;
  }

  .lesson-faq-item summary strong {
    padding-right: 1.4rem;
  }

  .lesson-faq-item summary::after {
    position: absolute;
    right: 0;
  }

  .lesson-faq-item summary {
    position: relative;
  }

  .lesson-faq-answer {
    margin-left: 0;
    margin-right: 1.5rem;
  }
}